Sam Smith is the latest celebrity to join James Corden for his popular Carpool Karaokesegment.

The UK singer-songwriter is set to release his second album ‘The Thrill of It All’ tomorrow (November 3).

Smith andThe Late Late Showhost belted out the singer's hits, chatted about dieting and a host of other things, as well as Smith’s album.

Later on in the skit, the star admitted how much he loves the US girl group Fifth Harmony, calling himself a Harmonizer, so was clearly ecstatic when they suddenly jumped into the vehicle to join him and Corden for a surprise rendition of their hit "Work From Home".

Watch Smith Sam's reaction to Fifth Harmony joining them as well as the rest of his Carpool Karaoke segment with James Corden, below: